Shared Commander deck
Koma, Cosmos Serpent - community staples
Koma, Cosmos Serpent · GU · 100 cards · 39 lands
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Bracket 3 - UpgradedCommander 1Creatures 40Instants 10Sorceries 7Enchantments 3Lands 39
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Strategy
Koma, Cosmos Serpent leads a deck built from the cards players most often run with it. The list holds 16 ramp pieces, 9 pieces of targeted interaction, 5 board wipes and 9 sources of card draw, at an average mana value of 3.90.
Early: The early turns belong to ramp. Cultivate and the other 16 ramp pieces exist to get Koma, Cosmos Serpent out well before its printed cost of 7 would allow.
Mid: Once the commander is down, the deck wants to be doing two things at once: advancing its own board and answering everyone else's. Counterspell is the first answer you will usually reach for, and Elemental Bond keeps the hand full while you do it.
Late: Hold Whelming Wave for the turn the table gets ahead of you - with 5 in the deck you can afford to use one early and still have an answer later. At 3.90 average mana value the top end is genuinely expensive - land drops matter.
Win conditions: Wins through the commander and the strongest threats the colours offer, backed by real interaction.
- Adrix and Nev, Twincasters - Core to the plan
- Elemental Bond - Card draw
- Whelming Wave - Board wipe
- Koma, World-Eater - Core to the plan
- Spark Double - Core to the plan
- Junk Winder - Core to the plan
- Parallel Lives - Core to the plan
- Serpent of Yawning Depths - Core to the plan
~$629.38
estimated to build this deck
Commander (1)
Koma, Cosmos Serpent
Legendary Creature — Serpent
This spell can't be countered.
At the beginning of each upkeep, create a 3/3 blue Serpent creature token named Koma's Coil.
Sacrifice another Serpent: Choose one —
• Tap target permanent. Its activated abilities can't be activated this turn.
• Koma gains indestructible until end of turn.
Creatures (40)
Adrix and Nev, Twincasters
Legendary Creature — Merfolk Wizard
$7.23
Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
If one or more tokens would be created under your control, twice that many of those tokens are created instead.
Koma, World-Eater
Legendary Creature — Serpent
$0.61
This spell can't be countered.
Trample, ward {4}
Whenever Koma deals combat damage to a player, create four 3/3 blue Serpent creature tokens named Koma's Coil.
Spark Double
Creature — Illusion
$4.49
You may have this creature enter as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary.
Junk Winder
Creature — Serpent
$0.26
Affinity for tokens (This spell costs {1} less to cast for each token you control.)
Whenever a token you control enters, tap target nonland permanent an opponent controls. It doesn't untap during its controller's next untap step.
Serpent of Yawning Depths
Enchantment Creature — Serpent
$8.97
Krakens, Leviathans, Octopuses, and Serpents you control can't be blocked except by Krakens, Leviathans, Octopuses, and Serpents.
Sakashima of a Thousand Faces
Legendary Creature — Human Rogue
$17.44
You may have Sakashima enter as a copy of another creature you control, except it has Sakashima's other abilities.
The "legend rule" doesn't apply to permanents you control.
Partner (You can have two commanders if both have partner.)
Aesi, Tyrant of Gyre Strait
Legendary Creature — Serpent
$11.29
You may play an additional land on each of your turns.
Landfall — Whenever a land you control enters, you may draw a card.
Spawning Kraken
Creature — Kraken
$13.83
Whenever a Kraken, Leviathan, Octopus, or Serpent you control deals combat damage to a player, create a 9/9 blue Kraken creature token.
Arixmethes, Slumbering Isle
Legendary Creature — Kraken
$0.58
Arixmethes enters tapped with five slumber counters on it.
As long as Arixmethes has a slumber counter on it, it's a land. (It's not a creature.)
Whenever you cast a spell, you may remove a slumber counter from Arixmethes.
{T}: Add {G}{U}.
Sakura-Tribe Elder
Creature — Snake Shaman
$0.34
Sacrifice this creature: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
Tatyova, Benthic Druid
Legendary Creature — Merfolk Druid
$0.19
Landfall — Whenever a land you control enters, you gain 1 life and draw a card.
Craterhoof Behemoth
Creature — Beast
$22.57
Haste
When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of creatures you control.
Sakashima the Impostor
Legendary Creature — Human Rogue
$14.26
You may have Sakashima the Impostor enter as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has "{2}{U}{U}: Return Sakashima the Impostor to its owner's hand at the beginning of the next end step."
Murkfiend Liege
Creature — Horror
$2.16
Other green creatures you control get +1/+1.
Other blue creatures you control get +1/+1.
Untap all green and/or blue creatures you control during each other player's untap step.
Garruk's Packleader
Creature — Beast
$0.16
Whenever another creature you control with power 3 or greater enters, you may draw a card.
Ohran Frostfang
Snow Creature — Snake
$7.45
Attacking creatures you control have deathtouch.
Whenever a creature you control deals combat damage to a player, draw a card.
Summon: Leviathan
Enchantment Creature — Saga Leviathan
$1.76
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Return each creature that isn't a Kraken, Leviathan, Merfolk, Octopus, or Serpent to its owner's hand.
II, III — Until end of turn, whenever a Kraken, Leviathan, Merfolk, Octopus, or Serpent attacks, draw a card.
Ward {2}
Hullbreaker Horror
Creature — Kraken Horror
$5.72
Flash
This spell can't be countered.
Whenever you cast a spell, choose up to one —
• Return target spell you don't control to its owner's hand.
• Return target nonland permanent to its owner's hand.
Roaming Throne
Artifact Creature — Golem
$47.88
Ward {2}
As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
If a triggered ability of another creature you control of the chosen type triggers, it triggers an additional time.
Eternal Witness
Creature — Human Shaman
$0.72
When this creature enters, you may return target card from your graveyard to your hand.
Enduring Vitality
Enchantment Creature — Elk Glimmer
$17.26
Vigilance
Creatures you control have "{T}: Add one mana of any color."
When Enduring Vitality dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)
Archetype of Imagination
Enchantment Creature — Human Wizard
$0.57
Creatures you control have flying.
Creatures your opponents control lose flying and can't have or gain flying.
Esix, Fractal Bloom
Legendary Creature — Fractal
$0.44
Flying
The first time you would create one or more tokens during each of your turns, you may instead choose a creature other than Esix and create that many tokens that are copies of that creature.
Slinn Voda, the Rising Deep
Legendary Creature — Leviathan
$0.35
Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell.)
When Slinn Voda enters, if it was kicked, return all creatures to their owners' hands except for Merfolk, Krakens, Leviathans, Octopuses, and Serpents.
Octomancer
Creature — Frog Druid
$0.35
Gift an Octopus (You may promise an opponent a gift as you cast this spell. If you do, when it enters, they create an 8/8 blue Octopus creature token.)
At the beginning of each end step, create a token that's a copy of target creature token that entered the battlefield this turn.
Coiling Oracle
Creature — Snake Elf Druid
$0.16
When this creature enters, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put that card into your hand.
Fanatic of Rhonas
Creature — Snake Druid
$15.89
{T}: Add {G}.
Ferocious — {T}: Add {G}{G}{G}{G}. Activate only if you control a creature with power 4 or greater.
Eternalize {2}{G}{G} ({2}{G}{G}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Snake Druid with no mana cost. Eternalize only as a sorcery.)
The Unagi of Kyoshi Island
Legendary Creature — Serpent
$1.43
Flash
Ward—Waterbend {4}. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {4}. They can tap their artifacts and creatures to help. Each one pays for {1}.)
Whenever an opponent draws their second card each turn, you draw two cards.
Chameleon, Master of Disguise
Legendary Creature — Human Shapeshifter Villain
$0.4
You may have Chameleon enter as a copy of a creature you control, except his name is Chameleon, Master of Disguise.
Mayhem {2}{U} (You may cast this card from your graveyard for {2}{U} if you discarded it this turn. Timing rules still apply.)
Scute Swarm
Creature — Insect
$8.37
Landfall — Whenever a land you control enters, create a 1/1 green Insect creature token. If you control six or more lands, create a token that's a copy of this creature instead.
Curiosity Crafter
Creature — Bird Wizard
$0.3
Flying
You have no maximum hand size.
Whenever a creature token you control deals combat damage to a player, draw a card.
Starwinder
Creature — Leviathan
$1.03
Whenever a creature you control deals combat damage to a player, you may draw that many cards.
Warp {2}{U}{U} (You may cast this card from your hand for its warp cost. Exile this creature at the beginning of the next end step, then you may cast it from exile on a later turn.)
Xolatoyac, the Smiling Flood
Legendary Creature — Salamander Serpent
$1.29
Whenever Xolatoyac enters or attacks, put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it.
At the beginning of your end step, untap each permanent you control with a counter on it.
Delighted Halfling
Creature — Halfling Citizen
$27.19
{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a legendary spell, and that spell can't be countered.
Nezahal, Primal Tide
Legendary Creature — Elder Dinosaur
$8.64
This spell can't be countered.
You have no maximum hand size.
Whenever an opponent casts a noncreature spell, draw a card.
Discard three cards: Exile Nezahal. Return it to the battlefield tapped under its owner's control at the beginning of the next end step.
Reclamation Sage
Creature — Elf Shaman
$0.19
When this creature enters, you may destroy target artifact or enchantment.
Instants (10)
Beast Within
Instant
$0.61
Destroy target permanent. Its controller creates a 3/3 green Beast creature token.
Growth Spiral
Instant
$0.28
Draw a card. You may put a land card from your hand onto the battlefield.
Heroic Intervention
Instant
$9.16
Permanents you control gain hexproof and indestructible until end of turn.
Cyclonic Rift
Instant
$30.27
Return target nonland permanent you don't control to its owner's hand.
Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
Fierce Guardianship
Instant
$63.56
If you control a commander, you may cast this spell without paying its mana cost.
Counter target noncreature spell.
Pongify
Instant
$2
Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.
An Offer You Can't Refuse
Instant
$3.01
Counter target noncreature spell. Its controller creates two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")
Arcane Denial
Instant
$1.57
Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.
Sorceries (7)
Whelming Wave
Sorcery
$0.83
Return all creatures to their owners' hands except for Krakens, Leviathans, Octopuses, and Serpents.
Irenicus's Vile Duplication
Sorcery
$10.81
Create a token that's a copy of target creature you control, except the token has flying and it isn't legendary.
Cultivate
Sorcery
$0.36
Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.
Kodama's Reach
Sorcery — Arcane
$1.5
Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.
Rampant Growth
Sorcery
$0.41
Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
Nature's Lore
Sorcery
$1.8
Search your library for a Forest card, put that card onto the battlefield, then shuffle.
Farseek
Sorcery
$0.46
Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
Enchantments (3)
Elemental Bond
Enchantment
$3.28
Whenever a creature you control with power 3 or greater enters, draw a card.
Parallel Lives
Enchantment
$29.42
If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.
Rhystic Study
Enchantment
$67.53
Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.
Lands (39)
Boseiju, Who Endures
Legendary Land
$48.29
{T}: Add {G}.
Channel — {1}{G}, Discard this card: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That player may search their library for a land card with a basic land type, put it onto the battlefield, then shuffle. This ability costs {1} less to activate for each legendary creature you control.
Yavimaya, Cradle of Growth
Legendary Land
$17.03
Each land is a Forest in addition to its other land types.
Otawara, Soaring City
Legendary Land
$26.49
{T}: Add {U}.
Channel — {3}{U}, Discard this card: Return target artifact, creature, enchantment, or planeswalker to its owner's hand. This ability costs {1} less to activate for each legendary creature you control.
Temple of the False God
Land
$0.17
{T}: Add {C}{C}. Activate only if you control five or more lands.
Command Beacon
Land
$7.91
{T}: Add {C}.
{T}, Sacrifice this land: Put your commander into your hand from the command zone.
Mosswort Bridge
Land
$0.3
Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
This land enters tapped.
{T}: Add {G}.
{G}, {T}: You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater.
Rogue's Passage
Land
$0.39
{T}: Add {C}.
{4}, {T}: Target creature can't be blocked this turn.
Three Tree City
Legendary Land
$28.42
As Three Tree City enters, choose a creature type.
{T}: Add {C}.
{2}, {T}: Choose a color. Add an amount of mana of that color equal to the number of creatures you control of the chosen type.
Mystic Sanctuary
Land — Island
$1.11
({T}: Add {U}.)
This land enters tapped unless you control three or more other Islands.
When this land enters untapped, you may put target instant or sorcery card from your graveyard on top of your library.
Alchemist's Refuge
Land
$0.4
{T}: Add {C}.
{G}{U}, {T}: You may cast spells this turn as though they had flash.
Mistrise Village
Land
$6.98
This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {U}.
{U}, {T}: The next spell you cast this turn can't be countered.
Basic lands: 12 Forest 15 Island
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